Broadcom ACPL-355JC Reference Manual page 19

ACPL-355JC Reference Manual 62-mm SiC Module EB1200M62-355JC Evaluation Board
Figure 12: Gate Driver Circuit – Low-Voltage Side
While the input LED is directly polarized, and there is no fault, the turn-on command will be transferred to the high-voltage
side and the ACPL-355JC V pin will go high. The ANODE pin is pulled high via resistor R3. The input signal LED_IN_P
OUTP
is connected to the CATHODE pin. When the input LED_IN_P signal is low, the LED is directly polarized and the MOSFET
is turned on. If the input signal LED_IN_P is high, the voltage across the LED and the two resistors is low; therefore the LED
is not conducting and the MOSFET is in off state.
External PWM signals that propagate through the user interface connector are buffered, as shown in Figure 13. Because
the buffer features an open drain output, inputs of the buffer are pulled down while outputs of the buffer are pulled high, to
ensure that the MOSFET module is off in case the input PWM signals are in high impedance states.
Figure 13: PWM Buffer
Broadcom ACPL-355JC-62mmSiC-RM100
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